fix: Disable JSON_SCHEMA_FOR_FUNC_DECL by default

PiperOrigin-RevId: 926912698

Author: google-genai-bot

contributing/samples/tools/pydantic_argument/agent.py

@@ -18,16 +18,9 @@
 from typing import Union
 
 from google.adk.agents.llm_agent import Agent
-from google.adk.features import FeatureName
-from google.adk.features import override_feature_enabled
 from google.adk.tools.function_tool import FunctionTool
 import pydantic
 
-override_feature_enabled(
-    FeatureName.JSON_SCHEMA_FOR_FUNC_DECL,
-    True,
-)
-
 
 class UserProfile(pydantic.BaseModel):
   """A user's profile information."""

src/google/adk/features/_feature_registry.py

@@ -135,7 +135,7 @@ class FeatureConfig:
         FeatureStage.EXPERIMENTAL, default_on=True
     ),
     FeatureName.JSON_SCHEMA_FOR_FUNC_DECL: FeatureConfig(
-        FeatureStage.EXPERIMENTAL, default_on=False
+        FeatureStage.EXPERIMENTAL, default_on=True
     ),
     FeatureName._MCP_GRACEFUL_ERROR_HANDLING: FeatureConfig(
         FeatureStage.EXPERIMENTAL, default_on=True